down due to lots of complicated factors including the ocean tides and shifts in how the Earth’s mass is distributed. All this means that days are getting ever so slightly longer, a few milliseconds at a time. If we continued to assume that all days are exactly 86,400 seconds long, our clocks would drift out of alignment with the sun. Wait long enough and it would start rising at midnight.
In 1972, BIMP agreed to a simple fix: leap seconds. Like leap days, leap seconds would be inserted into the year so as to align Universal Coordinated Time with the Earth-tracking Universal Time . Leap seconds aren’t needed predictably or very often. So, instead of having a regular pattern for adding them, BIMP would tally up all the extra milliseconds and it was necessary, tell everyone to add one whole millisecond to the clock. Between 1972 and now, 27 leap seconds have been inserted into UTC.
The problem is that all the interlinked computers on the internet use UTC to function, not just let you know that it’s time for lunch. When files are saved to a database, they’re time stamped with UTC; when you play an online video game, it relies on UTC to work out who shot first; if you post a Tweet, UTC is in the mix.
Its all relative. Time to make a drink and contemplate what I'll do in 2035.
Big deal. Where I work, almost all the computers display a different time!
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